We analyze the performance of the single dwell code acquisition in severe Doppler environment. Both the carrier frequency offset and code frequency offset due to the Doppler effect are taken into account. The effect of the code Doppler gives rise to the code chip slipping during the correlation process. Moreover, the power reduction through the bandpass filter caused by the carrier Doppler can degrade the acquisition performance significantly. However, this issue can be alleviated by properly choosing the bandwidth of the bandpass filter in the acquisition loop. Results are presented for cases which show that the acquisition loop can tolerate Doppler frequency offset at the price of a slight performance degradation.
{"title":"Code acquisition of direct-sequence spread spectrum communication with Doppler shift","authors":"S. Su, Nan-Yang Yen, Sheng-Cheng Hsieh","doi":"10.1109/ICC.1995.524483","DOIUrl":"https://doi.org/10.1109/ICC.1995.524483","url":null,"abstract":"We analyze the performance of the single dwell code acquisition in severe Doppler environment. Both the carrier frequency offset and code frequency offset due to the Doppler effect are taken into account. The effect of the code Doppler gives rise to the code chip slipping during the correlation process. Moreover, the power reduction through the bandpass filter caused by the carrier Doppler can degrade the acquisition performance significantly. However, this issue can be alleviated by properly choosing the bandwidth of the bandpass filter in the acquisition loop. Results are presented for cases which show that the acquisition loop can tolerate Doppler frequency offset at the price of a slight performance degradation.","PeriodicalId":241383,"journal":{"name":"Proceedings IEEE International Conference on Communications ICC '95","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121772790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A unified design approach based on fully utilizing the switch bandwidth in a dilated banyan network is proposed. The design method is based on a switch model called the fat-banyan model with the objective of achieving high performance at minimal cost. Previously proposed dilated banyan networks form a subclass of the fat-banyan model. In this paper we show that the stage dilation in the fat-banyan is a function of the cell loss rate at each stage, to ensure optimal dilation. Simulation results for cell loss probability and throughput are presented for the independent uniform traffic case. The performance of the fat-banyan as an output-buffered switch is also investigated.
{"title":"A unified design approach for dilated banyan switches","authors":"M. Alimuddin, H. Alnuweiri, R. Donaldson","doi":"10.1109/ICC.1995.524277","DOIUrl":"https://doi.org/10.1109/ICC.1995.524277","url":null,"abstract":"A unified design approach based on fully utilizing the switch bandwidth in a dilated banyan network is proposed. The design method is based on a switch model called the fat-banyan model with the objective of achieving high performance at minimal cost. Previously proposed dilated banyan networks form a subclass of the fat-banyan model. In this paper we show that the stage dilation in the fat-banyan is a function of the cell loss rate at each stage, to ensure optimal dilation. Simulation results for cell loss probability and throughput are presented for the independent uniform traffic case. The performance of the fat-banyan as an output-buffered switch is also investigated.","PeriodicalId":241383,"journal":{"name":"Proceedings IEEE International Conference on Communications ICC '95","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131949074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper considers the performance of code division multiple access (CDMA) communications. Of particular interest is the evaluation of the average bit error rate (BER) which cannot be performed analytically in most practical situations. Conventional Monte Carlo simulation can provide an alternative performance evaluation tool. Unfortunately, such an approach is often limited by the excessive computational burden. Importance sampling is a modified Monte Carlo technique which can significantly reduce the computational cost required to achieve accurate Monte Carlo estimates. We describe the basic principles behind this method. In particular, we illustrate its use for the efficient simulation of asynchronous direct-sequence (DS) based CDMA systems employing binary phase shift keying modulation along with specific signature sequences for a variety of system parameters.
{"title":"BER estimation of asynchronous DS/CDMA communications systems","authors":"K. B. Letaief, J. Chuang, J. Sadowsky","doi":"10.1109/ICC.1995.524422","DOIUrl":"https://doi.org/10.1109/ICC.1995.524422","url":null,"abstract":"This paper considers the performance of code division multiple access (CDMA) communications. Of particular interest is the evaluation of the average bit error rate (BER) which cannot be performed analytically in most practical situations. Conventional Monte Carlo simulation can provide an alternative performance evaluation tool. Unfortunately, such an approach is often limited by the excessive computational burden. Importance sampling is a modified Monte Carlo technique which can significantly reduce the computational cost required to achieve accurate Monte Carlo estimates. We describe the basic principles behind this method. In particular, we illustrate its use for the efficient simulation of asynchronous direct-sequence (DS) based CDMA systems employing binary phase shift keying modulation along with specific signature sequences for a variety of system parameters.","PeriodicalId":241383,"journal":{"name":"Proceedings IEEE International Conference on Communications ICC '95","volume":"170 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132023747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Multicarrier modulation (MCM) is an effective and robust technique to combat ISI in wideband signalling over multipath radio channels. A coded MCM system is analyzed. An upper-bound is given for the average BER (bit error rate) performance of the system. An expression is provided to calculate the matched-filter bounds in terms of the symbol-spaced multipath intensity profile coefficients. It is shown that the system performance meets and in some cases exceeds the matched-filter bounds provided that a proper channel coding and interleaving is used. Computer simulation is performed to support and clarify the results of analysis.
{"title":"On the performance of a coded MCM over multipath Rayleigh fading channels","authors":"A. Chini, M. S. El-tanany, S. Mahmoud","doi":"10.1109/ICC.1995.524488","DOIUrl":"https://doi.org/10.1109/ICC.1995.524488","url":null,"abstract":"Multicarrier modulation (MCM) is an effective and robust technique to combat ISI in wideband signalling over multipath radio channels. A coded MCM system is analyzed. An upper-bound is given for the average BER (bit error rate) performance of the system. An expression is provided to calculate the matched-filter bounds in terms of the symbol-spaced multipath intensity profile coefficients. It is shown that the system performance meets and in some cases exceeds the matched-filter bounds provided that a proper channel coding and interleaving is used. Computer simulation is performed to support and clarify the results of analysis.","PeriodicalId":241383,"journal":{"name":"Proceedings IEEE International Conference on Communications ICC '95","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130274047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The paper examines wireless local area network (WLAN) applications based on the DS-CDMA technique. It paper deals with the equalization of the indoor radio channel. The equalization is based on the RAKE processing of the received signal. The estimation of the weights of the channel has been carried out in two steps: the former consists in a preliminary estimation based on isolating the desired magnitudes from the received signal by means of correlation techniques; the latter accomplishes a linear regression on the samples provided by the preliminary estimation in order to counteract the delay caused by a filtering operation. The system performance, in terms of BER versus E/sub b//N/sub o/, is provided.
{"title":"Channel estimation using linear prediction for wireless indoor communications","authors":"S. Carcopardi, F. Gatti, G. Reali","doi":"10.1109/ICC.1995.524254","DOIUrl":"https://doi.org/10.1109/ICC.1995.524254","url":null,"abstract":"The paper examines wireless local area network (WLAN) applications based on the DS-CDMA technique. It paper deals with the equalization of the indoor radio channel. The equalization is based on the RAKE processing of the received signal. The estimation of the weights of the channel has been carried out in two steps: the former consists in a preliminary estimation based on isolating the desired magnitudes from the received signal by means of correlation techniques; the latter accomplishes a linear regression on the samples provided by the preliminary estimation in order to counteract the delay caused by a filtering operation. The system performance, in terms of BER versus E/sub b//N/sub o/, is provided.","PeriodicalId":241383,"journal":{"name":"Proceedings IEEE International Conference on Communications ICC '95","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131506408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A new communication technique based on the utilisation off synthetic chaos is described. This spread spectrum communication regime is enabled through the use of pseudonoise (PN) sequences, also referred to as direct sequences (DS). Attention is given to both point-to-point and multi-user communication. It is demonstrated that direct modulation of a modified logistic mapping can be used to achieve orthogonality among the users. Furthermore it is illustrated that the user-to-user isolation can be improved by the proper selection of the mapping parameters. The resulting communication regime promises to accommodate more users than the direct sequence CDMA regime.
{"title":"Point-to-point and multi-user communication based on chaotic sequences","authors":"J. Elmirghani, R. Cryan","doi":"10.1109/ICC.1995.525234","DOIUrl":"https://doi.org/10.1109/ICC.1995.525234","url":null,"abstract":"A new communication technique based on the utilisation off synthetic chaos is described. This spread spectrum communication regime is enabled through the use of pseudonoise (PN) sequences, also referred to as direct sequences (DS). Attention is given to both point-to-point and multi-user communication. It is demonstrated that direct modulation of a modified logistic mapping can be used to achieve orthogonality among the users. Furthermore it is illustrated that the user-to-user isolation can be improved by the proper selection of the mapping parameters. The resulting communication regime promises to accommodate more users than the direct sequence CDMA regime.","PeriodicalId":241383,"journal":{"name":"Proceedings IEEE International Conference on Communications ICC '95","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131816398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We consider a power control scheme for maximizing the information capacity of the uplink in single-cell multiuser communications with frequency-flat fading, under the assumption that the users attenuations are measured perfectly. Its main characteristics are that only one user transmits over the entire bandwidth at any particular time instant and that the users are allocated more power when their channels are good, and less when they are bad. Moreover, these features are independent of the statistics of the fading. Numerical results are presented for the case of single-path Rayleigh fading. We show that an increase in capacity over a perfectly-power controlled (Gaussian) channel can be achieved, especially if the number of users is large. By examining the bit error-rate with antipodal signalling, we show the inherent diversity in multiuser communications over fading channels.
{"title":"Information capacity and power control in single-cell multiuser communications","authors":"R. Knopp, P. Humblet","doi":"10.1109/ICC.1995.525188","DOIUrl":"https://doi.org/10.1109/ICC.1995.525188","url":null,"abstract":"We consider a power control scheme for maximizing the information capacity of the uplink in single-cell multiuser communications with frequency-flat fading, under the assumption that the users attenuations are measured perfectly. Its main characteristics are that only one user transmits over the entire bandwidth at any particular time instant and that the users are allocated more power when their channels are good, and less when they are bad. Moreover, these features are independent of the statistics of the fading. Numerical results are presented for the case of single-path Rayleigh fading. We show that an increase in capacity over a perfectly-power controlled (Gaussian) channel can be achieved, especially if the number of users is large. By examining the bit error-rate with antipodal signalling, we show the inherent diversity in multiuser communications over fading channels.","PeriodicalId":241383,"journal":{"name":"Proceedings IEEE International Conference on Communications ICC '95","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129388566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We examine the design of a communication link involving the data transfer from a small, low-orbit satellite to a ground station, but through a geostationary satellite. The advantage of this approach is that a single ground station, which tracks only the geostationary satellite, may be shared by a multiplicity of small satellites. Our goal is to select certain small satellite parameters-signaling rate, small satellite antenna beamwidth, and modulation scheme-which maximize the data throughput in bits per day. Our approach uses both simulations of this scenario and theoretical analysis based on the channel cutoff rate, R/sub 0/.
{"title":"Optimal parameters for a low-orbit to geostationary satellite link","authors":"P. A. Quintana, W. E. Ryan","doi":"10.1109/ICC.1995.524522","DOIUrl":"https://doi.org/10.1109/ICC.1995.524522","url":null,"abstract":"We examine the design of a communication link involving the data transfer from a small, low-orbit satellite to a ground station, but through a geostationary satellite. The advantage of this approach is that a single ground station, which tracks only the geostationary satellite, may be shared by a multiplicity of small satellites. Our goal is to select certain small satellite parameters-signaling rate, small satellite antenna beamwidth, and modulation scheme-which maximize the data throughput in bits per day. Our approach uses both simulations of this scenario and theoretical analysis based on the channel cutoff rate, R/sub 0/.","PeriodicalId":241383,"journal":{"name":"Proceedings IEEE International Conference on Communications ICC '95","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130817586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Barberis, E. Berruto, L. Bonzano, E. Gaiani, A. Napolitano, V. Palestini
In the paper the performance of a DS-CDMA system (designed within the CODIT project) is evaluated focusing on an indoor environment. This analysis gives an indication about the behaviour of the macrodiversity and soft handoff in a typical business environment. The work has been carried out in the RACE project R2020 CODIT in the framework of the Community Research Programme with a financial contribution by the Commission.
{"title":"Performance evaluation of a DS-CDMA system in indoor environment with macrodiversity","authors":"S. Barberis, E. Berruto, L. Bonzano, E. Gaiani, A. Napolitano, V. Palestini","doi":"10.1109/ICC.1995.524198","DOIUrl":"https://doi.org/10.1109/ICC.1995.524198","url":null,"abstract":"In the paper the performance of a DS-CDMA system (designed within the CODIT project) is evaluated focusing on an indoor environment. This analysis gives an indication about the behaviour of the macrodiversity and soft handoff in a typical business environment. The work has been carried out in the RACE project R2020 CODIT in the framework of the Community Research Programme with a financial contribution by the Commission.","PeriodicalId":241383,"journal":{"name":"Proceedings IEEE International Conference on Communications ICC '95","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132899959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Chadha, R. Erickson, S. Jani, L. Ness, C. Ratel
To enhance the overall quality of its network protocol testing process, Bellcore has developed TACIT, a toolkit for automated conformance and interoperability testing based on a formal and automated approach to test script generation. We first give a technical description of TACIT in which the different steps of the automated test script generation method are outlined, such as protocol specification and compilation, generic test script generation and executable test script encoding. We then relate how TACIT was experimentally used for testing of ISDN primary rate interface protocol. The results of this experiment are finally assessed and compared to the current script generation approach used at Bellcore.
{"title":"Automated test generation for improved protocol testing","authors":"R. Chadha, R. Erickson, S. Jani, L. Ness, C. Ratel","doi":"10.1109/ICC.1995.525158","DOIUrl":"https://doi.org/10.1109/ICC.1995.525158","url":null,"abstract":"To enhance the overall quality of its network protocol testing process, Bellcore has developed TACIT, a toolkit for automated conformance and interoperability testing based on a formal and automated approach to test script generation. We first give a technical description of TACIT in which the different steps of the automated test script generation method are outlined, such as protocol specification and compilation, generic test script generation and executable test script encoding. We then relate how TACIT was experimentally used for testing of ISDN primary rate interface protocol. The results of this experiment are finally assessed and compared to the current script generation approach used at Bellcore.","PeriodicalId":241383,"journal":{"name":"Proceedings IEEE International Conference on Communications ICC '95","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133024589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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